Method and apparatus for providing interface to original...

Details Method and apparatus for providing interface to original... Method and apparatus for providing interface to original...

2006-02-21

2006-02-21

Kwon, John T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S478000

Reexamination Certificate

active

07003393

ABSTRACT:
Method and apparatus for retrofitting a low impedance fuel injection system to a high impedance fuel injection system internal combustion engine is disclosed. The original high impedance electronic control system may be retained, while system modification circuitry is added along the fuel injector control path. In one aspect, an original fuel injector control signal is intercepted along the fuel injector control wire. The intercepted signal is then modified from a simple on-off signal to a signal which varies the fuel injector current as a function of time, such that the on-state from the original high impedance system is converted to a current controlled signal. Moreover, using a plurality of parameters, the fuel injector pulsewidth may be modified, as well as the peak and hold current levels provided to the fuel injectors.

REFERENCES:
patent: 4428051 (1984-01-01), Kuboki et al.
patent: 4502446 (1985-03-01), Kanegae et al.
patent: 4602324 (1986-07-01), Fujawa et al.
patent: 5813374 (1998-09-01), Chasteen
patent: RE37807 (2002-07-01), Shinogle et al.
patent: 6640543 (2003-11-01), Seal

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